A neutron diffraction study of the low-temperature magnetic phase of
Laboratoire Louis Néel, CNRS, BP 166 - 38042 Grenoble Cédex 9, France
2 Department of Physics, Faculty of Science, Yamaguchi University, Yamaguchi 753, Japan
Accepted: 14 September 1998
The low-field, low-temperature magnetic phase of the tetragonal compound is studied by neutron diffraction on a single crystal. The analysis of all the harmonics of the fundamental long-period commensurate propagation vector is consistent with the () magnetic structure in which one ninth of the moments of the magnetic unit cell vanish. The origin of such a non-usual structure is discussed.
PACS: 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
© EDP Sciences, 1998